Does anyone have access to these?

I'm having three specific problems with my Nov 1991 XR4x4 wiring:

1) Interior light works fine from the passenger door but not from the drivers door.
As far as I can tell from the car itself, there is a wire from each a-post switch to a relay on the steering bracket. From there, a wire goes to the delay relay in the fuse box and on up to the light.
If I use the driver's door terminal on the relay for the passenger door switch, the light comes on as normal so the relay seems ok, and the wire from the relay to the drivers door appears to be complete and working.

2) Door-ajar display shows the tailgate is open.
The microswitch on the catch has three tails but only two are connected. The third comes to a bullet connector but I can't see a corresponding wire for it to plug into, either in the tailgate or in the main loom at the roof.

3) Boot light isn't coming on.
Not sure where this is switched or how. The lamp has red and brown cables but no power.